对阿拉比多普西斯真空离子道ALMT9的结构洞察力显示了类特异性
Dandan Qian1, Yaru Chai2, Weiping Li1
1State Key Laboratory of Medicinal Chemical Biology and College of Life Sciences, Nankai University, Tianjin 300350, China.
Cell reports
|September 13, 2024
概括
阿拉比多普西斯·塔利亚纳激活酸转运体9 (AtALMT9) 是一个真空化通道,调节口腔开口. 它的结构显示W120控制道关闭,影响干旱应激反应.
科学领域:
- 植物分子生物学 植物分子生物学
- 结构生物学是结构生物学.
- 离子通道功能 离子通道功能
背景情况:
- 阿拉比多普西斯·塔利亚纳的激活的酸盐输送体9 (AtALMT9) 对于调节口腔孔径至关重要.
- 了解其结构功能关系是工厂水资源管理的关键.
研究的目的:
- 使用冷电子显微镜 (cryo-EM) 阐明AtALMT9功能的结构基础.
- 调查特定残留物在通道封闭和基质识别中的作用.
主要方法:
- 低温电子显微镜 (cryo-EM) 用于在三个状态下确定AtALMT9的结构.
- 位点定向突变发生 (W120A) 来评估功能影响.
- 在干旱压力下的野生类型和突变植物的表型分析.
主要成果:
- 在AtALMT9中,它形成了一种二聚体,其孔隙具有带正电荷的环.
- 阿波状态显示酸盐阻塞了孔隙,W120残留物形成了一个开放状态的门 (半径为1.8 Å).
- W120被确定为通道关闭的唯一决定因素.
- 突变的W120A显示增加干旱敏感性和持续的口腔开口.
- 在ALMT家族成员 (例如,GmALMT12,AtALMT1) 之间存在关门和基质识别的变化.
结论:
- 这项研究提供了AtALMT9的高分辨率结构,揭示了其关门机制.
- W120对于AtALMT9通道封闭和植物干旱耐受性至关重要.
- 这些发现加深了对ALMT家族功能和调节的理解.
关键词:
科普:分子生物学 分子生物学CP: 植物 植物用激活的酸盐运输器 9 9道门的道封锁是指通道的封锁.低温电磁波冷却器 (Cryo-EM) 是一个非常好的方法.牙口腔孔径的开口真空化物通道真空化物通道更多相关视频
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